使用 C# 添加附件到电子邮件

Question

我使用此答案中的以下代码通过 Gmail 在 .NET 中发送电子邮件。我遇到的问题是在电子邮件中添加附件。如何使用下面的代码添加附件？

using System.Net.Mail;

var fromAddress = new MailAddress("[email protected]", "From Name");
var toAddress = new MailAddress("[email protected]", "To Name");
const string fromPassword = "fromPassword";
const string subject = "Subject";
const string body = "Body";

var smtp = new SmtpClient
{
    Host = "smtp.gmail.com",
    Port = 587,
    EnableSsl = true,
    DeliveryMethod = SmtpDeliveryMethod.Network,
    UseDefaultCredentials = false,
    Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
};
using (var message = new MailMessage(fromAddress, toAddress)
    {
        Subject = subject,
        Body = body
    })
{
    smtp.Send(message);
}

Answer 1

通过 new MailMessage 方法调用创建的 message 对象具有属性 .Attachments。

例如：

message.Attachments.Add(new Attachment(PathToAttachment));

Answer 2

使用 MSDN：

// Create  the file attachment for this e-mail message.
Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
// Add time stamp information for the file.
ContentDisposition disposition = data.ContentDisposition;
disposition.CreationDate = System.IO.File.GetCreationTime(file);
disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);
disposition.ReadDate = System.IO.File.GetLastAccessTime(file);
// Add the file attachment to this e-mail message.
message.Attachments.Add(data);

Answer 3

像这样更正您的代码

System.Net.Mail.Attachment attachment;
attachment = new System.Net.Mail.Attachment("your attachment file");
mail.Attachments.Add(attachment);

http://csharp.net-informations.com/ communications/csharp-email-attachment.htm

希望这会对您有所帮助。

瑞奇

Answer 4

提示：如果之后添加附件，邮件正文会被附件文件路径覆盖，因此先附加后添加正文

mail.Attachments.Add(new Attachment(file));
mail.Body = "body";

Answer 5

一行答案：

mail.Attachments.Add(new System.Net.Mail.Attachment("pathToAttachment"));